showPanel method
Implementation
bool showPanel(Vertex<ID> v) {
if (_hoverVertex != v) return false;
var vTime = vHoverTime[v];
if (vTime == null) return false;
var delay = options?.panelDelay ?? const Duration(milliseconds: 300);
if (vTime.add(delay).compareTo(DateTime.now()) < 0) {
return true;
}
return false;
}